You can't- unless you trade
cheats
no only johto and kanto but you can get the 3 hoenn starters
you either have to trade with a friend or use an action replay code to catch another trainers Pokemon.
Train them!
defeat all the gym leaders in johto and kanto hope this helps
Once you defeat the all the Gym leaders from Johto and Kanto and the Elite Four go to Prof. Oak in Pallet Town and he will give you one of the Kanto starters.
Get a friend to trade them to you.
You should be able too by trading Pokemon.
256 pokemon. But all together 493.
you get it once you have all the johto gym badges then go to Professor Elm and he will give it to you
keep seaching in kanto and johto everywhere and you"l find it
You need to complete the gyms and the elite four in johto first